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Laboratory Test Sheet
Undrained Triaxial Compression Test - BS 1377 : Part 7 : 1990
Undrained Triaxial Compression Test
Location Job ref.
Borehole/Pit no.
Soil description Sample No.
Depth excavated
Group/Type Date Form
Test method                 BS1377: Part 7:  1990  5/15/94  8/9* 
Type of specimen Undisturbed/compacted* Nominal diameter
Preparation procedure
Specimen details Initially   After test Sketch showing specimen
location in original sample
Diameter D mm Mass g
Area Ao mm2 Dry mass g
Length Lo mm Moisture
Volume cm3 Content %
Mass g
Density Mg/m3
Compression test Single stage/Multistage, Stage*
Machine no Rate of Deformation Cell pressure
mm/min kPa
Membrane thickness Force device no. Mean calibration Stress factor
mm n/division kPa/div
Deformation Compression Strain Force gauge Axial force Correct Measured deviator stress
gauge of specimen e =  DL reading P area  
reading DL Lo     A = Ao (s1-s3) = 1000P  
      1 - e   A  
mm   N mm2 kPa
Sketch of Measured deviator stress  kPa
failure conditions Membrane correction  kPa
Corrected deviator stress  kPa
Axial strain   %
Inclination of Shear stress cu  kPa
Shear surface
Operator Checked Approved
* Delete as appropriate
Form 7G